PP-TD20 or PP TD20? What the Spelling Difference Actually Tells You

Why spellings vary

Compounds have no global naming standard. The same requirement may appear as PP-TD20, PP+TD20, PP TD20, PPTD20 or even PP-T20, abbreviating talc to T. They usually mean the same thing: polypropylene with 20% talc.

Usually is the operative word. Some suppliers use TD for talc, others T, and a few MD for mineral filled. Do not rely on the grade string alone.

Five things to verify instead

1. Actual loading and test method — ash content at 600 °C. 2. Talc mesh size and whether it is surface treated. 3. Whether the base resin is homopolymer, block copolymer or random copolymer PP, which governs low-temperature impact. 4. Whether a toughener is co-added. 5. Guaranteed values for flexural modulus and notched impact.

Once those five are clear, the spelling argument becomes irrelevant.

Procurement advice

When enquiring or ordering, attach a property requirement list rather than just a grade name — minimum flexural modulus, minimum notched impact, maximum shrinkage and so on. This keeps incoming material consistent even when changing supplier.

For long-running parts, agree a sealed limit sample and review it annually.